12388621 has 6 divisors (see below), whose sum is σ = 14411310. Its totient is φ = 10618776.

The previous prime is 12388609. The next prime is 12388633. The reversal of 12388621 is 12688321.

It is an interprime number because it is at equal distance from previous prime (12388609) and next prime (12388633).

It can be written as a sum of positive squares in only one way, i.e., 8037225 + 4351396 = 2835^2 + 2086^2 .

It is not a de Polignac number, because 12388621 - 2¹¹ = 12386573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12388661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 126366 + ... + 126463.

It is an arithmetic number, because the mean of its divisors is an integer number (2401885).

Almost surely, 2^12388621 is an apocalyptic number.

It is an amenable number.

12388621 is a deficient number, since it is larger than the sum of its proper divisors (2022689).

12388621 is an equidigital number, since it uses as much as digits as its factorization.

12388621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252843 (or 252836 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 12388621 is about 3519.7472920652. The cubic root of 12388621 is about 231.3880834920.

The spelling of 12388621 in words is "twelve million, three hundred eighty-eight thousand, six hundred twenty-one".